Merge remote-tracking branch 'refs/remotes/xyz/master'

1 files changed, 146 insertions, 0 deletions

diff --git a/nrfdemo/src/bme680/bme680_spi.c b/nrfdemo/src/bme680/bme680_spi.c
new file mode 100644
index 0000000..54840a7
--- /dev/null
+++ b/nrfdemo/src/bme680/bme680_spi.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2016, 2017 Intel Corporation
+ * Copyright (c) 2017 IpTronix S.r.l.
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ * Copyright (c) 2022, Leonard Pollak
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Bus-specific functionality for BME680s accessed via SPI.
+ */
+
+#include <zephyr/logging/log.h>
+#include "bme680.h"
+
+#if BME680_BUS_SPI
+
+LOG_MODULE_DECLARE(bme680, CONFIG_SENSOR_LOG_LEVEL);
+
+static int bme680_bus_check_spi(const union bme680_bus *bus)
+{
+	return spi_is_ready_dt(&bus->spi) ? 0 : -ENODEV;
+}
+
+static inline int bme680_set_mem_page(const struct device *dev, uint8_t addr)
+{
+	const struct bme680_config *config = dev->config;
+	struct bme680_data *data = dev->data;
+	uint8_t page = (addr > 0x7f) ? 0U : 1U;
+	int err = 0;
+
+	if (data->mem_page != page) {
+		uint8_t buf[2];
+
+		struct spi_buf tx_buf = {
+			.buf = &buf[0],
+			.len = 1,
+		};
+		const struct spi_buf_set tx = {
+			.buffers = &tx_buf,
+			.count = 1,
+		};
+
+		const struct spi_buf rx_buf[] = {
+			{ .buf = NULL, .len = 1 },
+			{ .buf = &buf[1], .len = 1 },
+		};
+		const struct spi_buf_set rx = {
+			.buffers = rx_buf,
+			.count = ARRAY_SIZE(rx_buf),
+		};
+
+		buf[0] = BME680_REG_STATUS | BME680_SPI_READ_BIT;
+		err = spi_transceive_dt(&config->bus.spi, &tx, &rx);
+		if (err < 0) {
+			return err;
+		}
+
+		if (data->mem_page == 1U) {
+			buf[1] &= ~BME680_SPI_MEM_PAGE_MSK;
+		} else {
+			buf[1] |= BME680_SPI_MEM_PAGE_MSK;
+		}
+
+		buf[0] = BME680_REG_STATUS & BME680_SPI_WRITE_MSK;
+		tx_buf.len = 2;
+		err = spi_write_dt(&config->bus.spi, &tx);
+		if (err < 0) {
+			return err;
+		}
+
+		data->mem_page = page;
+	}
+
+	return err;
+}
+
+static int bme680_reg_write_spi(const struct device *dev,
+				uint8_t reg, uint8_t val)
+{
+	const struct bme680_config *config = dev->config;
+	int err;
+	uint8_t cmd[] = { reg & BME680_SPI_WRITE_MSK, val };
+	const struct spi_buf tx_buf = {
+		.buf = cmd,
+		.len = sizeof(cmd)
+	};
+	const struct spi_buf_set tx = {
+		.buffers = &tx_buf,
+		.count = 1
+	};
+
+	err = bme680_set_mem_page(dev, reg);
+	if (err) {
+		return err;
+	}
+
+	err = spi_write_dt(&config->bus.spi, &tx);
+
+	return err;
+}
+
+static int bme680_reg_read_spi(const struct device *dev,
+			       uint8_t start, uint8_t *buf, int size)
+{
+	const struct bme680_config *config = dev->config;
+	int err;
+	uint8_t addr;
+	const struct spi_buf tx_buf = {
+		.buf = &addr,
+		.len = 1
+	};
+	const struct spi_buf_set tx = {
+		.buffers = &tx_buf,
+		.count = 1
+	};
+	struct spi_buf rx_buf[2];
+	const struct spi_buf_set rx = {
+		.buffers = rx_buf,
+		.count = ARRAY_SIZE(rx_buf)
+	};
+
+	rx_buf[0].buf = NULL;
+	rx_buf[0].len = 1;
+
+	addr = start | BME680_SPI_READ_BIT;
+	rx_buf[1].buf = buf;
+	rx_buf[1].len = size;
+
+	err = bme680_set_mem_page(dev, start);
+	if (err) {
+		return err;
+	}
+
+	err = spi_transceive_dt(&config->bus.spi, &tx, &rx);
+
+	return err;
+}
+
+const struct bme680_bus_io bme680_bus_io_spi = {
+	.check = bme680_bus_check_spi,
+	.read = bme680_reg_read_spi,
+	.write = bme680_reg_write_spi,
+};
+#endif /* BME680_BUS_SPI */